Java 如何在数组中插入项？

我的代码数组。如何在数组中插入项

int listElemCount = jCBWorkerMen.getItemCount();
Object[] selectionValues = null;
for (int i = 0; i < listElemCount; i++) {
        selectionValues[i]  =  (Object[]) jCBWorkerMen.getItemAt(i);
        System.out.println(selectionValues);
     }
String initialSelection = "Dogs";
Object selection = JOptionPane.showInputDialog(null, "What are your favorite   animals?", "Zoo Quiz", JOptionPane.QUESTION_MESSAGE, null, selectionValues,  initialSelection);
System.out.println(selection);

int-listlemcount=jCBWorkerMen.getItemCount（）；
Object[]selectionValues=null；
for（int i=0；i

如下所示

public static void main(String[] args) {

        List<Integer> list = new ArrayList<Integer>();
        list.add(1);
        list.add(2);
        list.add(3);
        list.add(4);
        list.add(5);
        list.add(6);
        list.add(7);
        list.add(8);
        list.add(9);
        list.add(10);

        Object[] selectionValues = new Object[list.size()];
        for (int i = 0 ; i < list.size() ; i++) {
            selectionValues[i] = list.get(i);
        }

        for (int i = 0 ; i < selectionValues.length ; i++) {
            System.out.println(selectionValues[i]);
        }
    }

publicstaticvoidmain（字符串[]args）{
列表=新的ArrayList（）；
增加第（1）款；
增加（2）；
增加（3）；
增加（4）；
增加（5）；
增加（6）；
增加（7）；
增加（8）；
增加（9）；
增加（10）；
Object[]selectionValues=新对象[list.size（）]；
对于（int i=0；i

您的算法不正确，这

---

变更代码如下所示

int listElemCount = jCBWorkerMen.getItemCount();
    Object[] selectionValues = new Object[listElemCount];
    for (int i = 0; i < listElemCount; i++) {
            selectionValues[i]  = jCBWorkerMen.getItemAt(i);
            //System.out.println(selectionValues);
         }
   //to view the all the items in the array
   for (int i = 0; i < listElemCount; i++) {            
            System.out.println(selectionValues[i]);
   }
    String initialSelection = "Dogs";
    Object selection = JOptionPane.showInputDialog(null, "What are your favorite   animals?", "Zoo Quiz", JOptionPane.QUESTION_MESSAGE, null, selectionValues,  initialSelection);
    System.out.println(selection);

int-listlemcount=jCBWorkerMen.getItemCount（）；
Object[]selectionValues=新对象[listElemCount]；
for（int i=0；i

使用

列表

，如

数组列表

，假设您的意思是要更改数组的长度…如果要插入（添加、更改长度等）数组，请使用

列表

，另请参见

jCBWorkerMen

的类型？您在这里到底想做什么？非常感谢。我喜欢你的回答！

int listElemCount = jCBWorkerMen.getItemCount();
Object[] selectionValues = new Object[listElemCount];
for (int i = 0; i < listElemCount; i++) {
    selectionValues[i] = jCBWorkerMen.getItemAt(i);
}
System.out.println(Arrays.toString(selectionValues));

int listElemCount = jCBWorkerMen.getItemCount();
    Object[] selectionValues = new Object[listElemCount];
    for (int i = 0; i < listElemCount; i++) {
            selectionValues[i]  = jCBWorkerMen.getItemAt(i);
            //System.out.println(selectionValues);
         }
   //to view the all the items in the array
   for (int i = 0; i < listElemCount; i++) {            
            System.out.println(selectionValues[i]);
   }
    String initialSelection = "Dogs";
    Object selection = JOptionPane.showInputDialog(null, "What are your favorite   animals?", "Zoo Quiz", JOptionPane.QUESTION_MESSAGE, null, selectionValues,  initialSelection);
    System.out.println(selection);